Mold



Nov. 15, 1932. J w COLUNS K 1,887,497

MOLD

Filed Oct. 18, 1929 v 2 Shee'S-Sheet l ffl-1.1

INVENTOR fof/N w. COM/N5 AT oRNEYs NOV. `15, 1932. w, CQLLINS 1,887,497

MOLD

Filed OC-t. 18, 1929 2 Sheets-Sheet 2 INVENTOR fof//v upon/Ns B ma A ORNEYS Y founding.

Patented Nov. 15, 1932 UNITED STA-TES PATENT "o1-FICE JOHN-Vw. coLLINs, or DETROIT, MIcnIoamAssIGNon To ALUMINUM coMraNY or AMERICA, or rrr'rsBURGH, PENNSYLVANIA, a CORPORATION or PENNSYLVANIA MOLD y Application tiled October 18, 1929. y Serial No. 400,497.

This invention relates to the art of metal More particularly itrelates to the making and use of green sand cores, and constitutes an improvement over the invention claimed in the co-pending application of Allen B. Norton, Serial No. 387,310, filed August 21, 1929, and owned by the assignee hereof.

Sand cores as made heretofore have been composed of green sand or baked sand. Where the core was simple it was usually made of green sand but where it was more complicated or required a core print to position or support it the core was usually baked. The cost of baked sand cores as contrasted with that of green sand cores is high and efforts have been made repeatedly to devise means of using green sand cores where baked cores have been used before.

It is an object of this invention to provide a green sand core" assembly which can be utilized where a, baked sand core having a. print has hitherto been necessary. It is a further object to provide a new and improved green sand core assembly and method of making the same. i

Other objects will be apparent from the specification and from the accompanying drawings in which latter Fig. 1 is a top plan view of a mold containingone form of sand core assembly embodying my invention.

Fig. 2 is a longitudinal vertical sectional view taken along the linel 2-2 of Fig. 1.

Fig. 3 is a transverse sectional view. showing a green sand core assembly and the core box used in making the same.

Fig. 4 is a transverse sectional view showing the green sand core assembly and core box at a later stage of the production of the core.

Fig. 5 is a transverse sectional view through the green sand core assembly; and

Fig. 6 is a View similar to Fig. 3 ofa modified core box.

Referring particularly to Figures 3, 4 and 5 of the drawings in its preferred embodiment, the greensand core assembly of this invention comprises the core 1 having a print 2 extending therefrom. The core is made of vving plate 3, core 1 and print 2.

any required shape while the print is preferably formed with converging outer surfaces which engage with and are supported by the converging surfaces of the walls of the supporting plate 3. The platej is provided w-ith positioning fianges 4 and 5 for a purpose to be later described.

The green sand core assembly is referably formed by positioning a split core ox 6 having cooperating cavities of any desired configuration, in a frame 7v as shown in Fig. 3. The supporting plate 3 is positioned upon the corek box 6 in inverted position as shown. Green sand is now poured through the opening ofthe supporting plate 3 into the core box and is compressed therein as by]- arring, blowi-ng, ramming or any suitable means of filling out the cavity ofthe core box and of the supporting plate recess. The upper surface of the sand is scraped away 'lush with the end of walls 5. In this manner a green sand core assemblyv is formed comprising the support- This assembly, together with the core box v6 and'plate 7 are now rolled over or turned into the position illustrated in Fig. 4 after which theframe is removedfrom the core box and the core box sectionsl are withdrawn from the core leaving the assembly vshown in Fig. 5 which without being baked can be utilized in a nwld. The green sand core 1 is supported upon themetal plate 3 and has sufiicient cohesion between the component particles thereof to' permit of its use as a green sand core without disintegration, The flanges 4 and 5 are utilized to position the assembly within' the mold. i y

. In Fig. 6 the core 1 and frame. 7 are the same as in Fig. 3`but core box 6a is provided with a flange 6b engagingv frame 7` and engaged by the shortened flange 4a of the supporting plate 5a. Themanner of assembly, use and disassembly of the core b'ox andparts of Fig. 6 is the same as above described for that of Fig. 3. a

Referring particularly to Figs. 1 and 2, the mold shown comprises a base 10 carrying the post 11 to which are hinged the mold sections, 12 and 13, at one end thereof. The other ends of the mold sections are latched together by means of a clamping block 14 which cooperates with the cam lever 15 to secure the same. The lever engages the mold section 12 and forces it into tight engagement with the mold section 13. The base 10 is providedwith an opening 16 extending therethrough and of a size and shape to receive the bottom flange 5 of the supporting plate 3 for preventing lateral movement thereof. The fiange 4 of the supporting plate rests upon the base 10 and circumferential movement thereof may be prevented by means of a key projection 17 on base 10 which engages in a key slot in the flange 4. The mold sections 12 and 13 are provided with recesses which are adapted to cooperate to form a cavity around the core 1. Above the cavity and opening thereinto the mold sections 12 and 13 carry opposed recesses at 18 opening through the top of the mold through which recesses the molten metal can be poured into the casting cavity. i

An auxiliary core 20 is supported upon the base 10 and protrudes through cooperating recesses in the mold sections 12 and 13 and terminates in spaced relation to the sand core 1 and in spaced relation to the-inner walls .of the mold sections to form .an outwardly protruding casting cavity adapted to lcooperate with the first mentioned casting cavity as, for example, to form a handle upon the article being cast.

In utilizing the device the sand core assembly is positioned upon the base 1() of the mold with the flange 4 resting thereon and the Adownwardly extending flange 5 positioned in the recess 16. The projection 17 is secured in place upon the base projecting into the slot of the plate 3. The core 2O is secured upon the base. The mold sections 12 and 13 are now swung into cooperating engagement and are locked in closed position. The molten metal to be cast is poured through the feed inlet 18 of the mold and permitted to flow into and around the casting cavity. Upc solidification of the metal the mold is opened and the core is broken away from the interior of the cast article.

By the procedure described, baked sand cores have been dispensed with in many instances and in lieu'thereof a green sand core has been provided with a print secured thereto which is so self-supporting that it can be handled and utilized for casting without disintegration. The core assembly is accurately positioned in the mold with a minimum of care and attention on the part of the operator.

wWhile a specific embodiment of the invention has been shown and described it will be apparent that modifications can be made therein within the spirit and scope of the invention and such modifications are intended to becovered by the appended claims.

What is claimed is:

1. A mold comprising base, a recessed sup porting member positioned on the base, and a green sand core associated therewith, the core having a print extending into the recess to maintain the fixed relative position of the b'ase, the core, print and members.

2. A mold comprising a base, having a 'counter-bored recess therein, a supporting member having an extension fitting into the recess to position the member laterally with respect to the base and having'a flange engaging in the counter-bore of the recess to position the member vertically with respect to the base, a green sand core carried by and resting upon said supporting member, and mold sections arranged to be clamped about said supporting member to position the mold sections with respect to the core and having a casting cavity surrounding the core.

3. A mold `comprising a base-having a recess therein, a supporting member having an extension engaging the recess in the base to position the member laterally and vertically with respect to the base, said supporting member having a downwardly tapering opening therein, a green sand core resting upon said supporting member and having a. print extending into said downwardly tapering opening, and mold sections arranged to be closed about said supporting member to form a castingcavity about said core.

In testimony whereof I hereunto affix my signature this 2 day of Oct., 1929.

JOHN W. COLLINS. 

